package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物城商品
     *
     * @param shoppingCartDTO
     */
    @Override
    public void addDshoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userid = BaseContext.getCurrentId();
        shoppingCart.setUserId(userid);
        //查询shoppingCart表是否存在数据
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //判断是否存在
        if (list != null && list.size() > 0) {
            //如果存在,+1
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            //如果不存在,插入一条数据.
            //判端本次添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //需要将菜品的名字,图片,价格信息,封装到ShoppingCart中
                //获取菜品的信息
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                //获取套餐的信息
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setCreateTime(LocalDateTime.now());
                shoppingCart.setNumber(1);
            }
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCart.setNumber(1);
            //无论是菜品还是套餐,统一插入数据
            shoppingCartMapper.insert(shoppingCart);
        }

    }

    /**
     * 查看购物车
     *
     * @return
     */
    @Override
    public List<ShoppingCart> showshoppingCart() {
        Long userid = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userid)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanshoppingCart() {
        Long userid = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByuserId(userid);
    }

    /**
     * 删除购物车中一个商品
     *
     * @param shoppingCartDTO
     * @return
     */
    @Override
    public ShoppingCart subShopping(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = showshoppingCart();


        if (list != null && list.size() > 0) {
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if (number == 1) {
                shoppingCartMapper.deleteById(shoppingCart.getId());
            } else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
    }return shoppingCart;
}
}
